When using a people control for assignment if you select a name then focus out and focus back into the field. Hit enter to bring up the list of names. Select the same name that was selected before the text box shows
on the line.
I think the correct behavior is to ignore the space and only show the list if the user changes something like deleting back or entering something forward. Or just don't show that name in the list if it's in the textbox or have the name reselect and have the correct name show up
Steps to reproduce the issue:
create form that has people control with list of users > 2.
type in the box to get list of names
put cursor in the name field at the end of entered name
this brings up the list with just the name entered up.
select that name
appears in the textbox